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Hi,
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for the most part this information is on the fuse cover try this website to see if you can download a owner manual for your van www.edmunds.com if all fails stop by your local GM-dealership in the parts department and they be able to print you off one wish you the best of luck Michigan Man.

You need to check what is called a fuseable link Its a special wire that is a reistance type wire its like a fuse . It runs of the posivite battery termenial a smaller 12 gauge red wire . Feel the jacket if its not tight to the copper wire then its blown . Its special wire you can cut it and jump it and use regular wire but if there is a problem its likely the vehicle will be damaged or catch unfire . You can get a new link but its a dealer part . Don't reck your computer be careful

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The power for the data link connector is from a 25amp fuse Number 7 in the IP fuse box. As long as the check engine light is on the computer has power.The main computer power is from two ECM fuses in the box near the battery.The fuse locations should be in the back of your owners manual.